770/771 Čmeliak – 8bit General Project

Project version 206.1.1
770/771 Čmeliak – 8bit General Project
8bit

Sound sample

Project Information

  • Universal sound project suitable for custom adjustments, especially light configurations.
  • Designed for 8-bit ZIMO MX sound decoders.
  • Recommended minimum decoder software version is 40.22.
  • The factory default address is 3.
  • Program CV8 = 8 to reset the decoder to the project defaults.

Function Assignment

Function mapping and CV settings can be modified.

  • F0 Position white lights
    Affected function output: FA0v, FA0r
    Direction dependent
  • F1 Light reserve
    Affected function output: FA1
  • F2 Light reserve
    Affected function output: FA2
  • F3 Shunting mode
    • speed range reduced to ½
    • reduces acceleration / braking times to ¼ of CV3 and CV4
    • triggers short horn at start
  • F4 Short horn
  • F5 Coasting
    Idle running sound regardless of set speed
  • F6 Engine acceleration to max RPM
    Independent of set speed, even when stationary
  • F7 Long horn
  • F8 Sound on/off
    Engine
  • F9 Unused
  • F10 Short whistle
  • F11 Long whistle
  • F12 Uncoupling screw down
  • F13 Uncoupling screw up
  • F14 Sanding
  • F15 Dispatcher whistle - new
    Call to readiness
  • F16 Dispatcher whistle - old
    Call to readiness, departure
  • F17 Compressor
  • F18 Switching sound sets
    Loaded / unloaded locomotive, when stationary
  • F19 Wheel squealing in curves
  • F20 Unused
  • F21 Unused
  • F22 Unused
  • F23 Unused
  • F24 Unused
  • F25 Unused
  • F26 Sound muting
  • F27 Volume decrease
  • F28 Volume increase

Setting Maximum Speed

Set the maximum speed via CV57. Changing CV5 alters the sound range, while CV57 leaves CV3/CV4 acceleration and braking times untouched.

Shunting Mode

Marker lights are disabled in shunting mode. Enable them together with the headlight by setting CV37 = 3.

The mode halves the speed range and reduces acceleration/braking times to a quarter of the CV3/CV4 values. Disable it via CV124 = 16; complete deactivation is possible with CV124 = 19. The default is CV124 = 18.

The script-triggered short horn requires F3, engine sound on via F8, and starting from zero speed. CV837 = 8 disables it (default CV837 = 0).

F5 Coasting vs F6 Engine to Maximum RPM

If both functions are active, coasting (F5) takes precedence.

Compressor

Two script-driven modes are available:

  1. Random activation while the engine sound (F8) is on; enabling F17 cancels it.
  2. Direct activation via F17 requiring F8 and zero speed.

CV837 = 1 disables F17, CV837 = 2 disables the random mode, and CV837 = 3 disables both.

Curve Squeal

Curve squeal requires F19 and F8 enabled, speed above 14 and below 100 (range 0–126). Set CV837 = 4 to disable the effect.

Custom Function Mapping

Use CV400 – CV428 for custom mapping if needed. The project itself does not rely on these CVs.

Decoder Reset

Program CV8 = 8 whenever you need to restore the default settings.

Basic CV Settings in Project

  • CV3 = 16
  • CV4 = 14
  • CV5 = 1
  • CV6 = 1
  • CV29 = 14
  • CV33 = 1
  • CV34 = 2
  • CV35 = 4
  • CV36 = 8
  • CV37 = 0
  • CV38 = 0
  • CV39 = 0
  • CV40 = 0
  • CV41 = 0
  • CV42 = 0
  • CV43 = 0
  • CV44 = 0
  • CV45 = 0
  • CV46 = 0
  • CV57 = 125
  • CV105 = 145
  • CV106 = 5
  • CV124 = 18
  • CV125 = 88
  • CV126 = 88
  • CV127 = 88
  • CV128 = 88
  • CV190 = 3
  • CV191 = 2
  • CV254 = 206
  • CV255 = 1
  • CV256 = 2
  • CV266 = 100
  • CV395 = 130
  • CV396 = 27
  • CV397 = 28
  • CV836 = 0
  • CV837 = 0

Sound Sample Numbers

F4 CV522 40 Short Horn
F7 CV531 39 Long Horn
F10 CV540 37 Short Whistle
F11 CV543 42 Long Whistle
F12 CV546 38 Screw Coupler Down
F13 CV549 43 Screw Coupler Up
F14 CV552 36 Sanding
F15 CV555 44 New Dispatcher Whistle
F16 CV558 45 Old Dispatcher Whistle
script 46 Compressor
script 47 Wheel Squeal in Curves

"Script" means that the corresponding sound is used inside a script outside the normal CV mapping. The number is provided for standalone use when the script is disabled.